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1994-11-13
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22KB
Date: Sun, 10 Apr 94 04:30:09 PDT
From: Ham-Ant Mailing List and Newsgroup <ham-ant@ucsd.edu>
Errors-To: Ham-Ant-Errors@UCSD.Edu
Reply-To: Ham-Ant@UCSD.Edu
Precedence: Bulk
Subject: Ham-Ant Digest V94 #98
To: Ham-Ant
Ham-Ant Digest Sun, 10 Apr 94 Volume 94 : Issue 98
Today's Topics:
10M 5/8 wave antenna
Antenna materials... (2 msgs)
Coax Loss on HF
Egg beater?
Help for low cost antenna
HF antenna help
HF in an apartment
Isoloop Experiences?
Ladder Line (3 msgs)
Low cost antenna for Tv
low cost antenna required
Rugged Repeater Antennas, Advice Needed
Temporary HF Mobile ant?
Send Replies or notes for publication to: <Ham-Ant@UCSD.Edu>
Send subscription requests to: <Ham-Ant-REQUEST@UCSD.Edu>
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the Ham-Ant Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/ham-ant".
We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
----------------------------------------------------------------------
Date: Sat, 9 Apr 1994 22:32:52 GMT
From: news.Hawaii.Edu!uhunix3.uhcc.Hawaii.Edu!jherman@ames.arpa
Subject: 10M 5/8 wave antenna
To: ham-ant@ucsd.edu
I'm constructing a 10M beacon for Hawaii. I believe the ideal antenna
would be a 5/8 wave vertical since it has a lower angle of radiation
which provides it a bit of gain over a dipole.
Questions:
- Should the radiating element be exactly 5/8 the transmitting wavelength?
- This antenna does not terminate in 50 ohms; what's the `ideal' matching
inductor/capacitor design at the base? (airwound? wire size? # of turns?
diameter?) [Oh, the xmtr has an output of about 10W]
- Has QST done an article on a 5/8 wave for 10M?
Thanks so much for your help.
Jeff NH6IL
P.S. Here's a list of 10M beacons (not too up-to-date, though). I pulled
this off of the email server at ham-server@grafex.sbay.org
***************************************************************************
From: ham-server@GRAFex.sbay.org
Subject: File K:/hamradio/10mbeaco.lst
The following 10 meter beacon list has been compiled and maintained by
Joe Gumino (K2OLG). If you have any corrections, additions or
deletions please direct them to me (WA2ZYU @ KB1BD-4) and I will
forward them to Joe. Thank you for your interest and response to this
list in the past. Joe and I shall work to keep it current.......agn
tnx & 73.
10 METER BEACON'S de K2OLG 2/19/90 Part 1
Edited and distributed under OKIPN by N8GTC
FREQ. CALL OPERATION LOCATION NOTES
28.175 VE3TEN C OTTAWA, CANADA 10W, GP
28.191 VE6YF EDMONTON, ALBERTA 10W
28.195 IY4M ROBOT BOLOGNA, ITALY 20W, 5/8 GP
28.200 GB3SX C CROWBOROUGH, ENGLAND 8W, DIPOLE
28.201 LU8ED ARGENTINA 5W
28.202 KE5GY ARLINGTON, TX 5W, VERTICAL
28.2025 ZS5VHF NATAL, RSA 5W, GP
28.204 DL0IGI C W. GERMANY 100W, VERT. DIPOLE
28.205 KA3OEM MEADVILLE, PA. 27W, YAGI/WEST
28.206 KJ4X PICKENS, SC 2W, VERTICAL
28.2075 W8FKL C VENICE, FLA 10W, VERT.
28.208 WA1IOB C MARLBORO, MASS 75W, VERT.
28.209 NX2O C STATEN ISLAND, NY 10W, GP
28.210 3B8MS C MAURITIUS GP
28.210 K4KMZ I ELIZABETHTOWN, KY. 20W, VERT.
28.210 KC4DPC C WILMINGTON,NC 4W, DIPOLE
28.212 EA6RCM PALMA DE MALLORCA 4W, 5 EL NNE
28.2125 ZD9GI C GOUGH IS. GP
28.215 GB3RAL C SLOUGH, BERKSHIRE 20W, GP
28.2175 W8UR MACKINAW ISLAND,MI .5W, GP
28.2175 WB9VMY C CALUMET, OK. 2W, DIPOLE
28.2195 LU4XS CAPE HORN
28.220 5B4CY C CYPRUS 26W, GP
28.221 PY2GOB SAN PAULO, BRAZIL 15W, VERT.
28.222 W9UXO C NR CHICAGO, ILL. 10W, GP
28.2225 HG2BHA C TAPOLCA, HUNGARY 10W, GP
*28.225 PY2AMI C SAO PAULO, BRAZIL 5W, DIPOLE
28.2275 EA6AU C MALLORCA, BALEARIC IS. 10W, 5/8 GP
28.230 ZL2MHF C MT. CLIMIE, NZ. 50W, VERT. DIPOLE
28.232 W7JPI/AZ C SONOITA, ARIZ. 5W, 3 EL YAGI NE
28.233 KD4EC C JUPITER, FLA. 7W, GP
28.235 VP9BA C HAMILTON, BERMUDA 10W, GP
28.2375 LA5TEN C OSLO, NORWAY 10W, 5/8 GP
28.2405 5Z4ERR C KIAMBU, KENYA
28.245 A92C BAHRAIN NW/SE DIPOLE
28.2455 ZS1CTB C CAPETOWN, RSA 20W, 1/4 VERT.
28.247 EA3JA BARCELONA, SPAIN
28.2475 EA2HB I SPAIN 6W, GP
28.248 K1BZ C BELAST, MAINE 5W, VERT. DIPOLE
28.250 W3SV C ELVERSON, PA 10W, VERT.
28.250 K0HTF C DES MOINES, IA 2W, GP
28.250 Z21ANB C BULAWAYO, ZIMBABWE 15W, GP
28.2505 4N3ZHK C MT. KUM, YUGOSLAVIA 1W, VERT.
28.252 WJ7X C SEATTLE, WA 5W, RINGO
28.252 WB4JHS I FLORISSANT, MO. 7W, VERT.
28.2525 OH2TEN FINLAND
28.255 LU1UG GRAL PICO, ARGENTINA 5W, GP
28.2575 DK0TEN C ARBEITSGEN, W. GERMANY 40W, GP
28.259 WB9FVR C PEMBROKE PINES, FLA. 1W, DIPOLE
28.260 VK5WI C ADELAIDE, SA, AUSTRALIA 10W, GP
28.262 VK2RSY C SYDNEY, NSW, AUSTRALIA 25W, GP
28.264 VK6RWA C PERTH, WA, AUSTRALIA
28.266 VK6RTW C ALBANY, WA, AUSTRALIA
28.266 KB4UPI C BIRMINGTON, ALA 20W, 1/4 VERT.
28.2685 W9KFO I EATON, ILL 750MW, VERT.
28.270 ZS6PW C PRETORIA, RSA 10W, 3 EL YAGI
28.270 VK4RTL C TOWNSVILLE, QLD, AUSTRALIA
28.2725 9L1FTN I FREETOWN, SIERRA LEONE 10W, VERT. DIPOLE
*28.2745 ZS1LA STILLBAY, RSA 20W, 3 EL YAGI NW
28.275 AL7GQ C DENVER, CO 1W, LOOP
28.2755 N6RDX I STOCKTON, CA 20W, 3 EL YAGI
28.2775 DF0AAB C KIEL, W. GERMANY 10W, GP
28.280 LU8EB ARGENTINA 5W
28.282 VE1MUF C FREDRICKTON, NB, CANADA 500MW, DIPOLE
28.282 VE2HOT C BEACONSFIELD, QUE 5W, VERT DIPOLE
28.2825 OK0EG C HRADEC KRALOVE 10W, DIPOLE
28.284 VP8ADE C ADELAIDE IS, NR ANTARCTICA 8W, V BEAM TO G LAND
*28.286 KE2DI NR ROCHESTER, NY 2W, VERT. DIPOLE
28.286 KK4M C LAS VEGAS, NEV. 5W, VERT.
28.287 W8OMV NR ASHVILLE, NC. 5W, GP
28.287 H44SI C SOLOMON IS. 15W
28.288 W2NZH I MOORESTOWN, NJ 3W, GP
28.290 SK5TEN SWEDEN
28.290 VS6TEN C HONG KONG 10W, VERT.
28.292 ZD8HF ASCENSION ISLAND
28.2925 LU2FFV SAN JORGE, ARGENTINA 5W, GP
28.295 WC8E I CINCINNATI, OHIO 10W, RINGO
28.296 W3VD C LAUREL, MARYLAND 1.5W, VERT. DIPOLE
28.297 WA4DJS I FT. LAUDERDALE, FLA 30W, GP
28.301 KF4MS C ST. PETERSBURG, FLA 5W
28.3025 PT7AAC FORTALEZA, BRAZIL 5W, GP
28.306 PT8AA RIO BRANCO, BRAZIL 5W, GP
28.315 ZS6DN C IRENE, RSA 100W, VERT.
28.888 W6IRT HOLLYWOOD, CA 5W, GP CODE PRACTICE
28.992 DF0ANN MOTITZBERG, W. GERMANY 20MW, 1 EL DELTA LOG
* REVISION
------------- cut here -----------------
-- This is the last part ---------------
---
End of session.
A new INDEX is placed on-line weekly. Files are constantly being added.
We are constantly on the lookout for new amateur radio related material.
If you have something you would like to share, contact me.
73 de KA6ETB@grafex.sbay.org . . . . . . . . . . . . . KA6ETB @ N0ARY.CA
------------------------------
Date: 9 Apr 94 18:51:37 GMT
From: sdd.hp.com!hpscit.sc.hp.com!icon!greg@hplabs.hp.com
Subject: Antenna materials...
To: ham-ant@ucsd.edu
Bill Plymale (plymale@mousetrap.es.vt.edu) wrote:
: Any thoughts or concerns associated with constructing an
: antenna using dissimilar materials? For instance, a beam
: consisting of a copper boom and aluminum elements.
: "Half-inch" copper tubing is readily available, half-inch
: aluminum tubing is not.
You will probably have corrosion problems if the two dissimilar metals contact
each other. Note that antenna dimensions change if the elements are isolated
or not. The ARRL Antenna Handbook lists dimensions for both.
Greg KD6KGW
------------------------------
Date: 9 Apr 1994 11:55:42 GMT
From: ihnp4.ucsd.edu!swrinde!emory!news-feed-2.peachnet.edu!insosf1.infonet.net!solaris.cc.vt.edu!mousetrap.es.vt.edu!plymale@network.ucsd.edu
Subject: Antenna materials...
To: ham-ant@ucsd.edu
Any thoughts or concerns associated with constructing an
antenna using dissimilar materials? For instance, a beam
consisting of a copper boom and aluminum elements.
"Half-inch" copper tubing is readily available, half-inch
aluminum tubing is not.
Thanks ... Bill (KD4CIY)
--
Bill Plymale plymale@mousetrap.es.vt.edu 703-231-9530
Virginia Tech - Information Systems
------------------------------
Date: Sun, 10 Apr 1994 01:59:32 GMT
From: ihnp4.ucsd.edu!library.ucla.edu!csulb.edu!csus.edu!netcom.com!gbrent@network.ucsd.edu
Subject: Coax Loss on HF
To: ham-ant@ucsd.edu
------------------------------
Date: Sun, 3 Apr 1994 17:17:53 GMT
From: ihnp4.ucsd.edu!library.ucla.edu!europa.eng.gtefsd.com!darwin.sura.net!news.Vanderbilt.Edu!news@network.ucsd.edu
Subject: Egg beater?
To: ham-ant@ucsd.edu
Jeff,
Eggbeaters are antennae make by M**2 engineering which are more or less
omnidirectional no matter how you look at them. They strongly
resemble half of an old mixer, such as was used in baking and scrambling
eggs. I personally have not used them, but most of the reports I have
seen from people using them for amateur satellite work are that for
that application they work, but not well enough to recommend.
Alan
Recommended
four
line
signature.
------------------------------
Date: Sat, 9 Apr 1994 06:52:24 GMT
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!ee.und.ac.za!csir.co.za!hippo.ru.ac.za!caesar.wits.ac.za!dlab164.ee.wits.ac.za!budhia@network.ucsd.edu
Subject: Help for low cost antenna
To: ham-ant@ucsd.edu
I require some info on designing a low cost antenna to rural communities
where signal levels are fairly low. Thus a low cost outdoor antenna is
required.
Any help on design procedures or even examples of existing antennas would be
appreciated.
Thanks
Harshik <budhia@underdog.ee.wits.ac.za>
------------------------------
Date: 9 Apr 1994 05:36:35 GMT
From: ihnp4.ucsd.edu!usc!cs.utexas.edu!chpc.utexas.edu!news.utdallas.edu!corpgate!bnrgate!bnr.co.uk!uknet!demon!news2.sprintlink.net!news.sprintlink.net!indirect.com!kg7bk@network.ucsd.edu
Subject: HF antenna help
To: ham-ant@ucsd.edu
Chuck Hawley (hawley@aries.scs.uiuc.edu) wrote:
: HarrisR@yvax.byu.edu (Richard Harris) writes:
: Put up a 100 or so foot dipole as high as you can get it, and feed it with
: 450 ohm ladder line. Run it through a 2KW tuner to a 100 Watt transceiver.
: 73, Chuck Hawley, KE9UW, Urbana, IL
: >Richard Harris
Hi Richard and Chuck,
I agree 100% and there are some little known facts that accompany this
non-resonant, center-fed, dipole, Zepp, G5RV, whatchamacallit. A
center-fed dipole is resonant at any number of frequencies. The name,
non-resonant, means that it is not resonant on an AMATEUR band. It is a
half-wave at some frequency and therefore, resonant at that frequency (and
any multiple of that frequency). A 102 ft. antenna is a half-wave around
4.6 MHz. An 88 ft. (my antenna) is a half-wave around 5.3 MHz. At about
three times the half-wave frequency, the radiation pattern from these
antennas changes from a two-lobe broadside pattern to a four-lobe
clover-leaf pattern with very little broadside radiation. Don't expect
your 102 ft. G5RV to radiate broadside on 17m. (Some would say, don't
expect your G5RV to radiate at all on 30m and 15m).
The frequency at
which a 102 ft center-fed antenna changes from two lobes to four lobes is
20m. One will see both the two side lobes and the four cloverleaf lobes
for a total of six lobes on 20m because three times 4.6 equals 13.8. I
chose 88 ft for my antenna because it has the two side lobes on 20m to
cover Australia and South Africa and has the four cloverleaf lobes on 17m
to cover Asia, New Zealand, Central/South America, and Europe. In Arizona,
I had to orient it N10W to aim the four lobes in the proper directions. If
one doesn't orient the antenna properly, most of the RF can be radiated
over the oceans instead of over land.
And please don't contribute to
global warming by feeding this kind of antenna with coax. Use
near-lossless ladder-line. Mother Nature will thank you.
73, Cecil, kg7bk@indirect.com
------------------------------
Date: Sun, 10 Apr 1994 08:00:01 GMT
From: agate!library.ucla.edu!csulb.edu!csus.edu!netcom.com!potaczek@ames.arpa
Subject: HF in an apartment
To: ham-ant@ucsd.edu
------------------------------
Date: 8 Apr 1994 12:15:06 -0400
From: ihnp4.ucsd.edu!galaxy.ucr.edu!library.ucla.edu!europa.eng.gtefsd.com!gatech!news.ans.net!hp81.prod.aol.net!search01.news.aol.com!not-for-mail@network.ucsd.edu
Subject: Isoloop Experiences?
To: ham-ant@ucsd.edu
In article <2o0sp8$r4j@wrdis02.robins.af.mil>, lakeith@robins.af.mil
(CONTRACTOR Larry Keith;653 CCSG/SCT) writes:
>>real world experiences
I've had mine up for almost two years (8 feet above chimney cap on two-story
house), and worked 230 countries with it (215 confirmed), won certificates for
both an ARRL and CQ WW DX contest (15m CW, low power, sixth call area), worked
39 zones in 6 months (and will probably die never working zone 34), and
generally have a good time with it. The constant re-tuning is a pain, and the
automatic tuner didn't work for me. Until I can overturn the XYL zoning
restriction at this QTH, it will have to do.
Danny AE9F/6
------------------------------
Date: 9 Apr 1994 00:18:46 -0400
From: ihnp4.ucsd.edu!usc!sol.ctr.columbia.edu!news.mtu.edu!news.mtu.edu!not-for-mail@network.ucsd.edu
Subject: Ladder Line
To: ham-ant@ucsd.edu
Where does one aquire 450ohm transmission quality ladderline? I have seen in
included in those over priced dipole kits, but I haven't found it anywhere sold
sepperatly. Is there a suitable substitute? Has anyone tried the stuff for
roof mounted TV antennas? Will that type of ladder line work?
I have heard many people talk about making their own ladder line. Can anyone
offer some suggestions on how to make your own ladder line?
Thanks
Chris -=- N8PBI
------------------------------
Date: 9 Apr 1994 05:28:07 GMT
From: usc!howland.reston.ans.net!cs.utexas.edu!chpc.utexas.edu!news.utdallas.edu!corpgate!bnrgate!bnr.co.uk!uknet!demon!news2.sprintlink.net!news.sprintlink.net!indirect.com!kg7bk@ihnp4.ucsd.edu
Subject: Ladder Line
To: ham-ant@ucsd.edu
Christopher D. Sorensen (cdsorens@mtu.edu) wrote:
: Where does one aquire 450ohm transmission quality ladderline? I have seen in
: Chris -=- N8PBI
Hi Chris, don't bother building ladder-line unless you have time to kill.
It's about $15 per 100 ft from Antennas West, 1-800-926-7373
73, Cecil, kg7bk@indirect.com
------------------------------
Date: Sat, 09 Apr 94 20:54:37 PDT
From: ihnp4.ucsd.edu!swrinde!emory!sol.ctr.columbia.edu!newsxfer.itd.umich.edu!nntp.cs.ubc.ca!mala.bc.ca!oneb!ham!emd@network.ucsd.edu
Subject: Ladder Line
To: ham-ant@ucsd.edu
cdsorens@mtu.edu (Christopher D. Sorensen) writes:
> Where does one aquire 450ohm transmission quality ladderline? I have seen in
> included in those over priced dipole kits, but I haven't found it anywhere so
> sepperatly. Is there a suitable substitute? Has anyone tried the stuff for
> roof mounted TV antennas? Will that type of ladder line work?
>
> I have heard many people talk about making their own ladder line. Can anyone
> offer some suggestions on how to make your own ladder line?
>
> Thanks
>
> Chris -=- N8PBI
>
Try calling Amateur Radio Supply in Seattle at 1-800-457-2277. I've seen
some there, and they ship to the US, Canada and Puerto Rico.
73, Bob.
Robert Smits There is *no* idiotproof filter.
VE7EMD Idiots are proof against anything!
Ladysmith B.C. - Richard Chycoski, VE7CVS
e-mail: emd@ham.almanac.bc.ca
------------------------------
Date: Sat, 9 Apr 1994 06:42:56 GMT
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!ee.und.ac.za!csir.co.za!hippo.ru.ac.za!caesar.wits.ac.za!dlab164.ee.wits.ac.za!budhia@network.ucsd.edu
Subject: Low cost antenna for Tv
To: ham-ant@ucsd.edu
I require some info on designiing a low cost antenna to rural communities
where signal levels are fairly low. Thus a low cost outdoor antenna is
required.
Any help on design procedures or even examples of existing antennas would be
appreciated.
Thanks
Harshik <budhia@underdog.ee.wits.ac.za>
------------------------------
Date: Sat, 9 Apr 1994 06:56:37 GMT
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!ee.und.ac.za!csir.co.za!hippo.ru.ac.za!caesar.wits.ac.za!dlab164.ee.wits.ac.za!budhia@network.ucsd.edu
Subject: low cost antenna required
To: ham-ant@ucsd.edu
I require some info on designing a low cost antenna to rural communities
where signal levels are fairly low. Thus a low cost outdoor antenna is
required.
Any help on design procedures or even examples of existing antennas would be
appreciated.
Thanks
Harshik <budhia@underdog.ee.wits.ac.za>
------------------------------
Date: Sat, 09 Apr 1994 12:53:12 -0500
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!ncar!hsdndev!NewsWatcher!user@network.ucsd.edu
Subject: Rugged Repeater Antennas, Advice Needed
To: ham-ant@ucsd.edu
I run two repeaters atop an isolated 2000 ft mountain in central VT where
the weather can be cruel on antennas. Over the past 5-6 years both 146.97
& 224.68 Sinclair Stationmasters (top mounted side by side 10 ft apart on a
Tee) developed leaks in their protective coverings, presumably due to UV
radiation and wind, and must be replaced. I would very much appreciate
other's experiences with the guality, durability, SWR, radiation patterns,
and gain of other high quality stationmaster-like antennas before I expend
lots of money to replace the old antennas. Please e-mail responses to
duffyr address below.
Frank K1MOQ (K1MOQ/R Tunbridge,VT, Orange County VT ARS)
--
Frank H. Duffy, MD e-mail: duffyfr@a1.tch.harvard.edu
Neurology, Childrens Hospital workstation: fhd@fhd486.harvard.edu
& Harvard Medical School FAX: (617) 735-7230
300 Longwood Avenue voice: (617) 735-7919 / 7846
Boston, MA 02115 USA amateur radio: K1MOQ
------------------------------
Date: 9 Apr 1994 22:01:10 -0400
From: ihnp4.ucsd.edu!usc!sol.ctr.columbia.edu!news.mtu.edu!news.mtu.edu!not-for-mail@network.ucsd.edu
Subject: Temporary HF Mobile ant?
To: ham-ant@ucsd.edu
Can anyone give some suggestions for a temporary mobile HF antenna. I will
be borrowing a car from the company I work for to use on my trip to Dayton
and would like to work HF on the way down. I have never worked HF mobile
because I didn't have a suitable rig untill now. I have an FT890 with the
automatic tuner.
Can anyone reccomend a decent antenna for probably 40meters? or whatever
band is best for HF mobile. The installation must be temporary and not do
any damage to the car. (Ie: No big scratches)... I will probably be
picking up a good HF mobile antenna at Dayton for my personal vehical
but would sure like to get something on the air for the trip down.
Any suggestions would be greatly appreciated!
73, Chris -=- N8PBI
------------------------------
End of Ham-Ant Digest V94 #98
******************************